This is from Nez in Austin, reference the nitrided Texas team barrels:

The longest running barrel we pulled out had 10741, it didn't need to be pulled, but I forced a friend to do so before he headed to the Nationals. The last 600 he shot was 198 with an 8 (he got burned) and 50% Xs. For a grand senior he was happy with the barrel.

The rest of the barrels we have out there are still running with varying round count as much as over 6K and still going.